Ah, the purple list of Googled terms in Bing disappeared after I cleared my autofill options in Chrome. Interestingly, just clearing cache and cookies did not remove the list.
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David FauxJun 9 '12 at 19:17

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That seems to be possibly a usage of local storage on browsers or cookies from where they could fetch recently searched terms.
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DharmavirJun 10 '12 at 4:38

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This is also because the form field <name> is q just like Google's. Doesn't look like they are taking advantage of local storage, just taking advantage of all the browsers autofill options on form field values of same name.
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DezJun 10 '12 at 21:50